CH5 - Development, Form, and Eruption

Question 1

Tooth buds/germs grow during

Answer 1

The sixth week of fetal life in alveolar bone

Question 2

Buds/germs are small clumps of

Answer 2

Cells that form the tooth tissues

Question 3

What forms first then second?

Answer 3

Dentin and enamel form first, cementum later

Question 4

What continues to form through lifetime?

Answer 4

Secondary dentin

Question 5

Hardening of tooth tissues by the deposition of mineral salts within these tissues is called?

Answer 5

Calcification

Question 6

Primary teeth calcify by

Answer 6

About 4th to 5th month of fetal life

Question 7

Permanent teeth begin to calcify by

Answer 7

Age 3 or 4 (age when deciduous teeth are fully formed)

Question 8

Growth centers where each tooth begins to develop

Answer 8

Developmental lobes

Question 9

Where does the developmental lobes centers grow from?

Answer 9

Tooth germ

Question 10

Developmental lobes grow until they

Answer 10

“fuse” or “coalescence”

Question 11

Point of fusion leaves a

Answer 11

“Developmental groove”

Question 12

Number of lobes necessary depends on

Answer 12

Type of tooth

Question 13

How many lobes do incisors have (which kind)?

Answer 13

• 3 facial lobes
• 1 lingual lobe

Question 14

The 3 labial developmental lobes are called the

Answer 14

• Mesiofacial lobes
• Centrofacial lobes
• Distofacial lobes

Question 15

The lingual lobe makes up the

Answer 15

Cingulum

Question 16

Mamelons are evident after the eruption of

Answer 16

Incisor teeth

Question 17

Mamelons are the ___ ridges of the 3 labial developmental lobes

Answer 17

Incisal ridges

Question 18

Mamelons are separated by

Answer 18

Developmental grooves

Question 19

When are mamelons only present?

Answer 19

When incisors first erupt

Question 20

How many lobes do max & mand premolars have?

Answer 20

• 3 facial lobes
• 1 lingual lobe

Question 21

How many cusps do mand premolars have?

Answer 21

2 or 3 cusps

Question 22

How many lobes do molars have?

Answer 22

• 2 facial lobes
• 2 lingual lobes

Question 23

First max molars may have a 5th lobe called

Answer 23

Cusp of Carabelli

Question 24

Teeth generally appear in

Answer 24

Pairs

Question 25

Permanent teeth erupt slightly earlier in

Answer 25

Girls

Question 26

Primary Mand central incisors erupt

Answer 26

6-8 months

Question 27

Primary Max central incisors erupt

Answer 27

8-10 months (2 months after mand)

Question 28

Primary Max lateral incisors erupt

Answer 28

1 year old

Question 29

Primary Mand lateral incisors erupt

Answer 29

1-2 months after max

Question 30

Primary Mand & Max first molars erupt

Answer 30

16 months (1 year 4 months)

Question 31

Primary Canines erupt

Answer 31

16-20 months

Question 32

Primary Second molars

Answer 32

2 years old

Question 33

All primary teeth are erupted by

Answer 33

2 and half years

Question 34

Process by which the roots of a deciduous tooth are resorbed

Answer 34

Exfoliation

Question 35

As permanent tooth erupts ___ destroy deciduous root

Answer 35

Osteoclasts

Question 36

Permanent mand central incisors erupt

Answer 36

6-7 years old

Question 37

Permanent max central incisors erupt

Answer 37

7-8 years old

Question 38

Permanent mand canines erupt

Answer 38

9-10 years old

Question 39

Permanent max canines erupt

Answer 39

11-12 years old

Question 40

Permanent first premolars erupt

Answer 40

10-12 years old

Question 41

Permanent second premolars erupt

Answer 41

10-12 years old

Question 42

Permanent first molars erupt

Answer 42

6 years old

Question 43

Permanent second molars erupt

Answer 43

11-13 years old

Question 44

Permanent third molars erupt

Answer 44

17+ years old

Question 45

The tendency of permanent molars to have an eruptive force toward the midline

Answer 45

Mesial drift

Question 46

Forms as teeth erupt and meet their antagonist in the opposite arch

Answer 46

Occlusal plane

Question 47

Occlusal plane is called the ___ unless it's flat

Answer 47

Curve of Spee

Question 48

Period of primary dentition

Answer 48

Begins with the eruption of first deciduous tooth; Lasts as long as only deciduous teeth are present

Question 49

Period of mixed dentition

Answer 49

Begins when first permanent molar erupts; Last until the final deciduous tooth is exfoliated (only permanent teeth remain)

Question 50

Period of permanent dentition

Answer 50

Begins when the last primary tooth is lost; ends when the last permanent tooth is lost